import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.SwingUtilities;

public class FileChooser extends JPanel
implements ActionListener {
	static private final String newline = "\n";
	JButton openButton, saveButton;
	JTextArea log;
	JFileChooser fc;

	public FileChooser() {
		super(new BorderLayout());

		//Create the log first, because the action listeners
		//need to refer to it.
		log = new JTextArea(5,20);
		log.setMargin(new Insets(5,5,5,5));
		log.setEditable(false);
		JScrollPane logScrollPane = new JScrollPane(log);

		//Create a file chooser
		fc = new JFileChooser();

		openButton = new JButton("Open a File...",
				createImageIcon("images/Open16.gif"));
		openButton.addActionListener(this);

		saveButton = new JButton("Save a File...",
				createImageIcon("images/Save16.gif"));
		saveButton.addActionListener(this);

		//For layout purposes, put the buttons in a separate panel
		JPanel buttonPanel = new JPanel(); //use FlowLayout
		buttonPanel.add(openButton);
		buttonPanel.add(saveButton);

		//Add the buttons and the log to this panel.
		add(buttonPanel, BorderLayout.PAGE_START);
		add(logScrollPane, BorderLayout.CENTER);
	}

	public void actionPerformed(ActionEvent e) {

		//Handle open button action.
		if (e.getSource() == openButton) {
			int returnVal = fc.showOpenDialog(FileChooser.this);

			if (returnVal == JFileChooser.APPROVE_OPTION) {
				File file = fc.getSelectedFile();
				//This is where a real application would open the file.
				log.append("Opening: " + file.getName() + "." + newline);
			} else {
				log.append("Open command cancelled by user." + newline);
			}
			log.setCaretPosition(log.getDocument().getLength());

			//Handle save button action.
		} else if (e.getSource() == saveButton) {
			int returnVal = fc.showSaveDialog(FileChooser.this);
			if (returnVal == JFileChooser.APPROVE_OPTION) {
				File file = fc.getSelectedFile();
				//This is where a real application would save the file.
				log.append("Saving: " + file.getName() + "." + newline);
			} else {
				log.append("Save command cancelled by user." + newline);
			}
			log.setCaretPosition(log.getDocument().getLength());
		}
	}

	/** Returns an ImageIcon, or null if the path was invalid. */
	protected static ImageIcon createImageIcon(String path) {
		java.net.URL imgURL = FileChooser.class.getResource(path);
		if (imgURL != null) {
			return new ImageIcon(imgURL);
		} else {
			System.err.println("Couldn't find file: " + path);
			return null;
		}
	}

	/**
	 * Create the GUI and show it.  For thread safety,
	 * this method should be invoked from the
	 * event dispatch thread.
	 */
	private static void createAndShowGUI() {
		//Create and set up the window.
		JFrame frame = new JFrame("FileChooserDemo");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		//Add content to the window.
		frame.add(new FileChooser());

		//Display the window.
		frame.pack();
		frame.setVisible(true);
	}

	public static void main(String[] args) {
		//Schedule a job for the event dispatch thread:
		//creating and showing this application's GUI.
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				//Turn off metal's use of bold fonts
				UIManager.put("swing.boldMetal", Boolean.FALSE); 
				createAndShowGUI();
			}
		});
	}
}
